... :open end, dome headMaterial: 5050# Aluminium rivet body, Steel mandrelSize: 4.8 x 20 mmFinishing: Zinc PlatedPacking: 250 pcs/box, 20 boxes/ctnStandard ... , dome/flat headFinishingZinc plated, polishing, coatedDia.3.2 mm, 4.0 mm, 4.8 mm, 6.4mmAlso, we are able to supply some ... most competitive price and better quality Aluminium Steel blind rivets (4.8 x 20)